Pump governor



Oct. 25, 1932. v, v, VEENSCHQTEN 1,884,929

PUMP GOVERNOR Filed June 30, 1928 2 Sheets-Sheet 1 30 16 G 22 g 15 IOct. 25, 1932. v. v. VEENSCHOTEN PUMP GOVERNOR Filed June 30, 1928 2Shuts-Sheet 2 23 [N VfNTO/i";

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Patented Oct. 25, 1932 UNITED STATES PATENT OFFICE VINCENT V.VEENSCHOTEN, OF ERIE, PENNSYLVANIA, ASSIGNOR TO NORTHERN EQUIP- MENTCOMPANY, OF ERIE, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA PUMPGOVERNOR Application filed June 30,

This invention relates to pump governors and, particularly, to governorswhich are applicable to steam pumps for pumping water where it isdesired to control the pressure on the water which is being delivered.The invention has for its object certain improvements relating to pumpgovernors which make more effective the proper discharge pressure,particularly with pumps which are delivering water where the backpressure 1s more or less variable. I

Of the accompanying drawings, Fig. 1 1s a more or less diagrammaticelevation of a power plant system which illustrates mechanism whichembodies the features of my invention; Fig. 2 is an enlarged sideelevation of the pump governor of the system; Fig. 3 is a sectional viewalong the line 33 of Fig. 2; and Fig. 4 is a sectional view along theline 4-4 of Fig. 3.

The system illustrated comprises a steam boiler 10 which receives waterthrough a pipe 11 from a pump 12, the pump being operated by a steamengine 13 receiving steam through a pipe 14, the speed of the enginebeing controlled by the governor 15.

The pump governor comprises a casing 16, mounted in the chamber 19 ofwhich is a compressible chamber 17, ordinarily called a sylphon bellows.The bellows receives steam under the pressure of the boiler through a.pipe 18 which is connected to the steam pipe 14, and the chamber 19, inwhich the bellows is mounted, receives water pressure through a pipe 20which is connected to the discharge pipe 21 of the steam pump, or to theinlet of the feed-water valve 22 of the boiler system.

Mounted in the steam pipe 14 is a steam valve casing 23 which controlsthe operation of the pump. In this valve is a valve plunger 24 which isoperatively connected with the sylphon bellows 17. The upper end of thebellows is fixed to the casing 16 and the lower and free end isconnected, by means of a stem 25, an arm 26, and a shaft 27, with an arm30 outside of the casing 16. The arm 30 is connected, b means of a link29, with an arm 28 which, y means of a shaft 31 and an arm 32, isconnected to the stem 33 1928. Serial No. 289,356.

of the valve 24. As a consequence of these connections, when the freeend of the bellows moves upwardly, the valve 24 will be lowered so as toclose the ports 35 more or less, depending upon the movement of thebellows end. On the other hand, when the bellows end is lowered, thevalve will be elevated somewhat, openin more the ports.

In operation, w en the water pressure in the discharge pipe of the pumpincreases above the desired amount, the water pressure in the chamber 19will compress the bellows elevating the lower end thereof and, thus,closing somewhat the valve ports 35 and reducing the power of the pumpand the pressure of the water delivered thereby, bringing the pressureback to the desired amount. On the other hand, if the pressure in thedis charge pipe decreases below the desired amount, the steam pressurein the chamber of the bellows will extend the bellows, forcing the freeend downwardly and, thus, opening somewhat more the orts 35. Fixed tothe shaft 31 is an arm 36 earing a weight 37. This weight takes up allloose play of the system and elevates the plunger when the waterpressure allows the free end of the bellows to move downwardly.

In case of an increase in pressure of the steam in the boiler and,hence, in the pipe 14, as there is then an increase in back pressure onthe water flowing into the boiler, it is desirable to increase thepressure in the dis charge pipe of the pump. In these conditions, theincreased pressure of the steam extends the bellows and allows theweight to open somewhat more the ports of the valve 24 and, thus,increases the power of the pump. Conversely, as the steam pressuredecreases, the water pressure will compress the bellows and the ports ofthe valve will be closed more or less.

It has become more and more desirable to increase the sensitiveness ofthe steam valve of the pump with reference to the variations in pressureof the water and steam, particularly in view of the enormous steampressures and capacities of modern boilers, and my invention is directedtowards increasing this sensitiveness beyond that ordinarily attained.

By the use of the rotating shafts 27 and 31 passing through therespective stalling boxes 40 and 41, the force required to operate theshafts is very greatly decreased with reference to the. force requiredto operatdshaft stems which slide longitudinally through the boxes. Theforce required to operate rotating shafts is so slight that very slightchanges in the steam or wate1"pressi1res will have full effect inoperating the pump steam valve.

In order to further increase the sensitiveness of the governor, Iprovide ball bearings 42 and 4.3 to oppose the thrust on the shafts 27and 31, due to the pressure on the inner ends of the shafts in thecasings 44 and 45. In

view of the enormous pressures which are frequently generated in modernboiler systems, the thrust on these shafts is very great, often fivehundred pounds or more, and ball hearings to overcome this increasematerially the sensitiveness of the governors.v The ball bearing casings46 are supported by brackets 47, and collars 48, fixed to the respectiveshafts 27 and 31, allow the bearings to carry the outward thrust on theshafts.

It will be noticed that the bellows casing 16 and the valve casing 23are entirely independent of each other. Hence, the controlling pressureson the bellows are in no way affected by pressures in the valve casing;and the use of the rotating shafts or spindles not only enormouslydecreases the force required to operate through the stufiing boxes, butalso allows any desired leverage controlling the relative movement ofthe free end of the bellows and the valve. This also allows a relativelylarge bellows with a moderate weight.

I have provided special stuffing box means to be used with either one orboth-of the rotary shafts or valve stems 27 and 31. This comprises asplit bushing 50 which is inserted in the gland 51 so that thebushingcan be removed from the shaft Without removing the collar 48 fromthe'shaft. I'also provide a nut 49 which is screwed on to the base 52 ofthe bracket 47, thus holding the bracket rigidly in place on thestuffing box 41. The advantage of this arrangement is tha-tthe nut 49can be backed off, and, after the arm 30 is removed from the outer endof the shaft, the entire bracket housing 47 and gland 51 can be removedfrom the shaft. The split bushing 50 is inserted to allow the gland 51to pass over the collar 48. This construction makes it very easy toremove the packing from the deep stufiing box and for replacing it withnew packing. After the packing is in place, the entire assembly isslipped over the shaft and the nut 49 is screwed into place.

I claim as my invention:

1. A pump governor comprising a valve casing, a valve mounted in saidcasing, a rotary shaft projecting into and out from said casing andbeing operatively connected with said valve, a second casing fixed tosaid valve casing, a rotary shaft projecting into and out from saidsecond casing, means operatively connecting the outer ends of saidshafts, means in said second casing for operatin g said second shaft,and ball bearings limiting outward movement of said shafts.

2. A pump governor comprising a valve casing, a valve mounted in saidcasing, a rotary spindle. projecting into and out from said casing, anarm projecting angularly from the inner portion of said spindle, saidarm being operatively connected with said valve, a second casing fixedto said valve casing, a rotary spindle projecting into and out from saidsecond casing, means operatively connecting the outer ends of saidspindles, means in said second casing for operating the spindle of saidcasing, and thrust bearings limiting the outward movement of saidspindles.

In testimony whereof, I hereunto set my hand VINCENT V. VEENSCHOTEN.

